Barychelidae, also known as brushed trapdoor spiders, is a spider family with about 300 species in 42 genera. Most spiders in this family build trapdoor burrows. For example, the long Sipalolasma builds its burrow in rotted wood, with a hinged trapdoor at each end. The long Idioctis builds its burrow approximately deep, just below the high tide level, sealing the opening with a thin trapdoor. Some species avoid flooding by plugging their burrows, while others can avoid drowning by trapping air bubbles within the hairs covering their bodies. Some members of this group have a rake on the front surface of their chelicerae used for compacting burrow walls. These spiders can run up glass like tarantulas, and some can stridulate, though it isn't audible to humans. Distribution Barychelids are found in Australia, New Caledonia, South America, Africa, Madagascar, India, New Guinea, and Pacific islands. Genera , the World Spider Catalog accepts the following genera: Ammonius Thorell, 1899 — Cameroon Atrophothele Pocock, 1903 — Yemen Aurecocrypta Raven, 1994 — Australia Barycheloides Raven, 1994 — New Caledonia Barychelus Simon, 1889 — New Caledonia Cosmopelma Simon, 1889 — Brazil Cyphonisia Simon, 1889 — Africa Cyrtogrammomma Pocock, 1895 — Guyana Diplothele O. Pickard-Cambridge, 1891 — Sri Lanka, India Encyocrypta Simon, 1889 — New Caledonia Eubrachycercus Pocock, 1897 — Somalia Fijocrypta Raven, 1994 — Fiji Idioctis L. Koch, 1874 — Oceania, Africa, Singapore Idiommata Ausserer, 1871 — Australia Idiophthalma O. Pickard-Cambridge, 1877 — South America Mandjelia Raven, 1994 — Australia Monodontium Kulczyński, 1908 — Singapore, Papua New Guinea, Indonesia Moruga Raven, 1994 — Australia Natgeogia Raven, 1994 — New Caledonia Neodiplothele Mello-Leitão, 1917 — Brazil Nihoa Raven & Churchill, 1992 — Papua New Guinea, Vanuatu Orstom Raven, 1994 — New Caledonia Ozicrypta Raven, 1994 — Australia Paracenobiopelma Feio, 1952 — Brazil Pisenor Simon, 1889 — Africa Plagiobothrus Karsch, 1892 — Sri Lanka Psalistops Simon, 1889 — Venezuela, Brazil, Costa Rica Questocrypta Raven, 1994 — New Caledonia Rhianodes Raven, 1985 — Malaysia, Singapore, Philippines Sason Simon, 1887 — Asia, Oceania, Seychelles Sasonichus Pocock, 1900 — India Seqocrypta Raven, 1994 — Australia Sipalolasma Simon, 1892 — Asia, Africa Strophaeus Ausserer, 1875 — Brazil, Peru, Panama Synothele Simon, 1908 — Australia Thalerommata Ausserer, 1875 — Colombia, Mexico Tigidia Simon, 1892 — Madagascar, Mauritius Trittame L. Koch, 1874 — Australia Troglothele Fage, 1929 — Cuba Tungari Raven, 1994 — Australia Zophorame Raven, 1990 — Australia Zophoryctes Simon, 1902 —